Robot arm



FIG. 1 is a robot arm in a perspective view;

FIG. 2 is a rear view thereof;

FIG. 3 is a front view thereof;

FIG. 4 is a left side view thereof;

FIG. 5 is a right side view thereof;

FIG. 6 is a top view thereof; and,

FIG. 7 is a bottom view thereof.

The broken fines are included for the purpose of illustrating portions of the robot arm that form no part of the claimed design. 

CLAIM The ornamental design for a robot arm, as shown and described. 